Bolster



FIG. 1 is an perspective view of a bolster;

FIG. 2 is a top view;

FIG. 3 is a side view showing one alignment of the feet of the bolster;

FIG. 4 is an alternate side view showing an alternate alignment of the feet of the bolster; and,

FIG. 5 is a bottom view.

The broken line showing in FIGS. 1, 2 and 5 is for illustrative purposes only and forms no part of the claimed design. 

The ornamental design for a bolster, as shown and described. 